Merge pull request #1428 from martin-helmich/docfix/cursor-map-return

Fix Cursor.prototype.map return annotation

Author: christkv

lib/cursor.js

@@ -979,7 +979,7 @@ define.classMethod('close', {callback: true, promise:true});
  * Map all documents using the provided function
  * @method
  * @param {function} [transform] The mapping transformation method.
- * @return {null}
+ * @return {Cursor}
  */
 Cursor.prototype.map = function(transform) {
   this.cursorState.transforms = { doc: transform };